I am still learning how to use Sig Sealer, but so far it seams to be working just fine and my local Hobby Store carries it. I found thinning 50/50 or 60 thinner 40 Sealer works pretty good. Sands super easy but takes 4 coats compared to 3 coats from Brodak. When thinned dries pretty fast, 20 -30 min to sand. I Will post pictures of my Estes Nimbus that has been sealed with Sig, also remember I don't use primer so my expectations are high for sealer.